Given
* Batch fetch size > 1
* A bi-directional many-to-one property
When
* execute HQL where the bi-directional property is used
Then
* {{Error performing dynamic instantiation}}
{code:java}@Entity
@Table(name = "ENTITY_A")
public class EntityA {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID")
Integer id;
@JoinColumn(name = "ENTITY_B")
@ManyToOne
@Fetch(FetchMode.SELECT)
EntityB entityB;
}
@Entity
@Table(name = "ENTITY_B")
public class EntityB {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID")
Integer id;
@Column(name = "FOO")
Integer foo;
@OneToMany(mappedBy = "entityB")
@Fetch(FetchMode.SUBSELECT)
List<EntityA> listOfEntitiesA = new ArrayList<>();
}
public class MyPojo {
private final Integer foo;
public MyPojo(EntityA a) {
foo = a.entityB.foo;
}
public Integer getFoo() {
return foo;
}
}{code}
{code:java} @Override
protected void configure(Configuration configuration) {
super.configure(configuration);
configuration.setProperty(AvailableSettings.SHOW_SQL, Boolean.TRUE.toString());
configuration.setProperty(AvailableSettings.FORMAT_SQL, Boolean.TRUE.toString());
configuration.setProperty(AvailableSettings.DEFAULT_BATCH_FETCH_SIZE, "2");
}
// Add your tests, using standard JUnit.
@Test
public void hhhXXXXTest() throws Exception {
try (Session s = openSession()) {
Transaction tx = s.beginTransaction();
EntityB entityB = new EntityB();
entityB.foo = 123;
s.persist(entityB);
EntityA entityA1 = new EntityA();
entityA1.entityB = entityB;
s.persist(entityA1);
s.flush();
s.clear();
tx.commit();
Query<MyPojo> query2 = s.createQuery(
"select new org.hibernate.bugs.MyPojo(t) from EntityA t where t.id = " + entityA1.id, MyPojo.class);
MyPojo pojo = query2.uniqueResult();
assertThat(pojo.getFoo()).isEqualTo(123);
}
}{code}
{noformat}org.hibernate.query.sqm.sql.internal.InstantiationException: Error performing dynamic instantiation : org.hibernate.bugs.MyPojo
at org.hibernate.sql.results.graph.instantiation.internal.DynamicInstantiationAssemblerConstructorImpl.assemble(DynamicInstantiationAssemblerConstructorImpl.java:55)
at org.hibernate.sql.results.internal.StandardRowReader.readRow(StandardRowReader.java:94)
at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:199)
at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:33)
at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.doExecuteQuery(JdbcSelectExecutorStandardImpl.java:362)
at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.executeQuery(JdbcSelectExecutorStandardImpl.java:168)
at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.list(JdbcSelectExecutorStandardImpl.java:93)
at org.hibernate.sql.exec.spi.JdbcSelectExecutor.list(JdbcSelectExecutor.java:31)
at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.lambda$new$0(ConcreteSqmSelectQueryPlan.java:109)
at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.withCacheableSqmInterpretation(ConcreteSqmSelectQueryPlan.java:302)
at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.performList(ConcreteSqmSelectQueryPlan.java:243)
at org.hibernate.query.sqm.internal.QuerySqmImpl.doList(QuerySqmImpl.java:518)
at org.hibernate.query.spi.AbstractSelectionQuery.list(AbstractSelectionQuery.java:367)
at org.hibernate.query.spi.AbstractSelectionQuery.uniqueResult(AbstractSelectionQuery.java:467)
at org.hibernate.bugs.ORMUnitTestCase.hhhXXXXTest(ORMUnitTestCase.java:76)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.hibernate.testing.junit4.ExtendedFrameworkMethod.invokeExplosively(ExtendedFrameworkMethod.java:45)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.NullPointerException: Cannot read field "foo" because "a.entityB" is null
at org.hibernate.bugs.MyPojo.<init>(MyPojo.java:9)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
at org.hibernate.sql.results.graph.instantiation.internal.DynamicInstantiationAssemblerConstructorImpl.assemble(DynamicInstantiationAssemblerConstructorImpl.java:52)
... 29 more{noformat}
Disabling batch fetch is a temporary work-around.
On a side note: also noticed that in a PreLoadEvent, the getState() does not contain the state of the bi-directional property
Failing test case to be attached and also available at [https://github.com/ratoaq2/HHH-16559|https://github.com/ratoaq2/HHH-16559|smart-link] |
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